Harbour Energy plc was founded by private equity firm EIG Global Energy Partners in 2014 with a strategy to acquire conventional, cash generative, producing assets outside of North America. In 2017, Harbour made its first acquisition backing Chrysaor Holdings Limited to acquire a package of UK North Sea assets from Shell for $3.0 billion and, in 2019, acquired ConocoPhillips UK North Sea for $2.7 billion.
In 2021, through a reverse takeover, Chrysaor merged with Premier Oil plc to create Harbour Energy plc.
Premier Oil was established in 1934, initially to explore for oil and gas in Trinidad. In the 2000s, the company grew its presence through a mixture of acquisitions and successful exploration programmes.
Chrysaor was founded in 2007 with the purpose of applying development and commercial skills to oil and gas assets and to realise their value safely. The group grew rapidly through a series of acquisitions.